- Fix invisible device while dragging from front to rear: the block
being dragged stayed structurally inside its own source <svg>, so it
rendered underneath the other panel once it visually overlapped it.
Replaced the in-SVG transform with a free-floating HTML ghost fixed
to <body> that tracks the pointer, unaffected by either SVG's own
stacking - the original block just dims in place during the drag, as
before.
- Fix rear elevation showing nothing for a device type with no
rear_image: only full-depth devices (which have a genuinely
different back) are restricted to their own rear image now; a
shallow device (e.g. a PDU) falls back to its front image on the
rear view, since that's usually the only picture that exists and is
still recognisable either way.
- Shorten the drag-hint badge text; the German translation of the
previous, longer wording didn't fit well next to the other controls
above the elevation.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>